Data at rest

Data at rest represents data that is stored in some sort of medium. Data at rest may represent data that is stored in databases. It is a good idea to apply security mechanisms to sensitive data. It is a good idea to encrypt or hash this data. For example instead of storing a password hash of that password is stored, to compare the password that is stored with a password that user enters, hash of the entered password is taken, and then both hashes are compared. If hashes equal to each other, then it is possible to conclude that passwords are also equal.

Two different words can result in same hash. It is called a hash collision.

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